:root{
  --ink:#101014;
  --paper:#F6F2E9;
  --cream:#FBF8F1;
  --brown:#241C16;
  --violet:#6D28D9;
  --violet-light:#C4B5FD;
  --lime:#A3E635;
  --lime-deep:#3F6212;
  --amber:#F59E0B;
  --amber-deep:#B45309;
  --muted:#5A5563;
  --line:rgba(16,16,20,.13);
  --line-strong:rgba(16,16,20,.26);
  --line-dark:rgba(246,242,233,.16);
  --on-dark:rgba(246,242,233,.76);
  --focus:#6D28D9;
  --rail-w:88px;
  --header-h:64px;
  --sans:"PingFang SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:"Songti SC","Source Han Serif SC","Noto Serif SC",Georgia,"Times New Roman",serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
}

*,
*::before,
*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;text-size-adjust:100%}

@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

body{
  margin:0;
  min-height:100vh;
  padding-left:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  font-weight:400;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body.is-nav-open{overflow:hidden}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}

::selection{background:var(--violet);color:#fff}

img,
svg,
video{display:block;max-width:100%}

a{color:var(--violet)}

button{font:inherit;color:inherit}

ul,
ol{margin:0;padding:0}

h1,
h2,
h3,
h4,
p,
figure,
blockquote{margin:0}

:where(a,button,input,select,textarea,[tabindex]):focus-visible{
  outline:3px solid var(--focus);
  outline-offset:3px;
  border-radius:3px;
}

.rail :focus-visible,
.foot :focus-visible{outline-color:var(--lime)}

.mono{
  font-family:var(--mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.06em;
  text-transform:uppercase;
}

.container{
  width:min(1200px,calc(100% - 48px));
  margin-inline:auto;
}

.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;
  border:1px solid var(--violet-light);
  border-radius:999px;
  background:var(--ink);
  color:var(--paper);
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  transition:transform .2s var(--ease);
}

.skip-link:focus{transform:translateY(0)}

/* ---------- side rail header ---------- */
.rail{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  z-index:80;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  width:var(--rail-w);
  padding:16px 0 18px;
  background:var(--ink);
  color:var(--paper);
  border-right:1px solid rgba(246,242,233,.12);
}

.rail__progress{
  --p:0;
  position:absolute;
  top:0;
  bottom:0;
  left:0;
  width:2px;
  background:rgba(246,242,233,.1);
  pointer-events:none;
  z-index:2;
}

.rail__progress span{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(180deg,var(--lime),var(--violet-light));
  transform:scaleY(var(--p));
  transform-origin:top;
  transition:transform .1s linear;
}

.rail__brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  color:inherit;
  text-decoration:none;
  padding-top:4px;
}

.rail__mark{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  border-radius:12px;
  background:var(--violet);
  color:#fff;
  font-family:var(--mono);
  font-size:14px;
  font-weight:800;
  letter-spacing:.02em;
  box-shadow:0 0 0 1px rgba(196,181,253,.55),0 10px 26px rgba(109,40,217,.4);
}

.rail__brand-text{
  display:flex;
  align-items:center;
  justify-content:center;
}

.rail__wordmark{
  writing-mode:vertical-rl;
  font-size:14px;
  font-weight:800;
  letter-spacing:.14em;
  line-height:1.1;
}

.rail__status{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  margin:0;
  padding:8px 5px;
  border:1px solid rgba(163,230,53,.36);
  border-radius:999px;
  background:rgba(163,230,53,.08);
  color:var(--lime);
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.08em;
  line-height:1.2;
}

.rail__status-text{writing-mode:vertical-rl}

.rail__dot{
  flex:none;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 10px rgba(163,230,53,.8);
}

.rail__toggle{
  display:none;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:0 12px;
  border:1px solid rgba(246,242,233,.24);
  border-radius:10px;
  background:transparent;
  color:var(--paper);
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  cursor:pointer;
}

.rail__toggle[aria-expanded="true"]{
  border-color:var(--violet-light);
  color:var(--violet-light);
}

.rail__toggle-lines{display:grid;gap:4px;width:18px}

.rail__toggle-lines span{
  display:block;
  height:2px;
  border-radius:1px;
  background:currentColor;
}

.rail__nav{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  flex:1 1 auto;
  width:100%;
  min-height:0;
  padding:4px 0;
  overflow-y:auto;
  scrollbar-width:thin;
  scrollbar-color:rgba(196,181,253,.3) transparent;
}

.rail__nav::-webkit-scrollbar{width:4px}
.rail__nav::-webkit-scrollbar-thumb{background:rgba(196,181,253,.3);border-radius:2px}

.rail__nav-head{display:none}

.rail__nav-title{color:var(--violet-light);font-size:10px}

.rail__tagline{display:none}

.rail__list{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:4px;
  width:100%;
  list-style:none;
}

.rail__link{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:4px;
  width:64px;
  padding:8px 4px;
  border-radius:10px;
  color:rgba(246,242,233,.7);
  text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease);
}

.rail__link:hover{
  background:rgba(196,181,253,.12);
  color:#fff;
}

.rail__link[aria-current="page"]{
  background:rgba(109,40,217,.3);
  color:#fff;
}

.rail__link[aria-current="page"]::before{
  content:"";
  position:absolute;
  top:50%;
  left:-12px;
  width:3px;
  height:30px;
  border-radius:2px;
  background:var(--violet-light);
  transform:translateY(-50%);
  box-shadow:0 0 12px rgba(196,181,253,.7);
}

.rail__index{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.08em;
  opacity:.75;
  font-variant-numeric:tabular-nums;
}

.rail__label{
  writing-mode:vertical-rl;
  font-size:12px;
  font-weight:600;
  letter-spacing:.12em;
  line-height:1.2;
}

.rail__nav-foot{display:none}

.rail__nav-note{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0;
  color:var(--lime);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.06em;
}

.rail__cta{
  writing-mode:vertical-rl;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:14px 7px;
  border:1px solid rgba(196,181,253,.5);
  border-radius:999px;
  background:var(--violet);
  color:#fff;
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.16em;
  text-decoration:none;
  box-shadow:0 8px 24px rgba(109,40,217,.35);
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}

.rail__cta:hover{
  background:var(--violet-light);
  border-color:var(--violet-light);
  color:var(--ink);
}

.rail__close{
  display:none;
  align-items:center;
  justify-content:center;
  width:38px;
  height:38px;
  border:1px solid var(--line-dark);
  border-radius:50%;
  background:transparent;
  color:var(--paper);
  font-size:20px;
  line-height:1;
  cursor:pointer;
}

.rail__scrim{display:none}

/* ---------- footer ---------- */
.foot{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  overflow:hidden;
  background:var(--brown);
  color:var(--paper);
}

.foot::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    radial-gradient(circle at 12% 0%,rgba(109,40,217,.34),transparent 46%),
    linear-gradient(rgba(246,242,233,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(246,242,233,.05) 1px,transparent 1px);
  background-size:auto,48px 48px,48px 48px;
  pointer-events:none;
}

.foot__inner{
  position:relative;
  padding-block:clamp(40px,6vw,72px) 26px;
}

.foot__top{
  display:grid;
  grid-template-columns:1.1fr 1.5fr 1fr;
  gap:clamp(24px,4vw,56px);
  padding-bottom:36px;
  border-bottom:1px solid rgba(246,242,233,.18);
}

.foot__brand{display:flex;flex-direction:column;align-items:flex-start}

.foot__logo{
  display:inline-block;
  color:var(--paper);
  font-size:clamp(30px,4.4vw,52px);
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1;
  text-decoration:none;
}

.foot__logo::after{
  content:"";
  display:block;
  width:56px;
  height:4px;
  margin-top:14px;
  border-radius:2px;
  background:var(--violet);
}

.foot__tagline{
  margin:18px 0 4px;
  color:var(--violet-light);
  font-size:14px;
  letter-spacing:.08em;
}

.foot__meta{
  margin:0 0 20px;
  color:rgba(246,242,233,.52);
  font-size:11px;
}

.foot__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:20px;
}

.foot__col{min-width:0}

.foot__title{
  margin:0 0 14px;
  color:var(--lime);
  font-family:var(--mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
}

.foot__list{
  display:grid;
  gap:9px;
  list-style:none;
}

.foot__link{
  color:rgba(246,242,233,.8);
  font-size:14.5px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}

.foot__link:hover{
  color:#fff;
  border-bottom-color:var(--violet-light);
}

.foot__contact{min-width:0}

.foot__dl{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:8px 14px;
  margin:0;
  font-size:13.5px;
}

.foot__dl dt{
  padding-top:2px;
  color:rgba(246,242,233,.5);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.05em;
  white-space:nowrap;
}

.foot__dl dd{
  margin:0;
  color:rgba(246,242,233,.88);
  overflow-wrap:anywhere;
}

.foot__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
  padding-top:20px;
}

.foot__legal{
  margin:0;
  color:rgba(246,242,233,.52);
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.05em;
}

.foot__note{
  flex:1 1 260px;
  margin:0;
  color:rgba(246,242,233,.52);
  font-size:12.5px;
}

.foot__top-link{
  padding-bottom:2px;
  border-bottom:1px solid rgba(196,181,253,.4);
  color:var(--violet-light);
  font-family:var(--mono);
  font-size:12px;
  text-decoration:none;
}

/* ---------- typography ---------- */
h1,
.h1{
  font-size:clamp(34px,5vw,64px);
  font-weight:900;
  line-height:1.08;
  letter-spacing:-.02em;
}

h2,
.h2{
  font-size:clamp(26px,3.4vw,40px);
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.015em;
}

h3,
.h3{
  font-size:clamp(20px,2.2vw,26px);
  font-weight:700;
  line-height:1.35;
  letter-spacing:-.01em;
}

.serif-heading{
  font-family:var(--serif);
  font-weight:700;
  letter-spacing:-.01em;
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--violet);
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.kicker::before{
  content:"";
  width:24px;
  height:1px;
  background:currentColor;
}

.lead{
  max-width:38em;
  color:rgba(16,16,20,.78);
  font-size:clamp(18px,2vw,21px);
  line-height:1.7;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  min-height:44px;
  padding:11px 20px;
  border:1px solid var(--ink);
  border-radius:999px;
  background:transparent;
  color:var(--ink);
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}

.btn:hover{transform:translateY(-1px)}

.btn--primary{
  border-color:var(--violet);
  background:var(--violet);
  color:#fff;
  box-shadow:0 8px 24px rgba(109,40,217,.28);
}

.btn--primary:hover{
  border-color:var(--violet-light);
  background:var(--violet-light);
  color:var(--ink);
}

.btn--ghost{
  border-color:var(--line-strong);
  background:transparent;
  color:var(--ink);
}

.btn--ghost:hover{
  border-color:var(--violet);
  background:rgba(109,40,217,.08);
  color:var(--violet);
}

.btn--light{
  border-color:var(--paper);
  background:var(--paper);
  color:var(--ink);
}

.btn--light:hover{
  border-color:var(--lime);
  background:var(--lime);
  color:var(--ink);
}

.btn--block{
  display:flex;
  width:100%;
}

/* ---------- chips ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:transparent;
  color:var(--muted);
  font-family:var(--mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.06em;
  line-height:1.5;
  white-space:nowrap;
}

.chip--violet{
  border-color:rgba(109,40,217,.4);
  background:rgba(109,40,217,.08);
  color:var(--violet);
}

.chip--lime{
  border-color:rgba(63,98,18,.35);
  background:rgba(163,230,53,.22);
  color:var(--lime-deep);
}

.chip--amber{
  border-color:rgba(180,83,9,.35);
  background:rgba(245,158,11,.16);
  color:var(--amber-deep);
}

.chip--on-dark{
  border-color:rgba(163,230,53,.4);
  background:rgba(163,230,53,.1);
  color:var(--lime);
}

/* ---------- layout ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:20px;
}

.grid--tight{gap:14px}

.span-2{grid-column:span 2}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

.bento{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:20px;
}

.bento__cell--wide{grid-column:span 2}
.bento__cell--tall{grid-row:span 2}
.bento__cell--focus{grid-column:span 2;grid-row:span 2}

.breath{height:clamp(72px,10vw,140px)}

.rule{
  height:1px;
  margin:0;
  border:0;
  background:var(--line);
}

.rule--tick{
  height:9px;
  background:repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 12px);
}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:22px;
}

.section-head__title{
  margin:0;
  font-size:clamp(24px,3vw,36px);
  font-weight:800;
  letter-spacing:-.015em;
}

/* ---------- framing ---------- */
.tick-frame{
  --tick:var(--violet);
  position:relative;
}

.tick-frame::before{
  content:"";
  position:absolute;
  inset:10px;
  z-index:1;
  pointer-events:none;
  opacity:.6;
  background:
    linear-gradient(var(--tick),var(--tick)) left top/14px 1px no-repeat,
    linear-gradient(var(--tick),var(--tick)) left top/1px 14px no-repeat,
    linear-gradient(var(--tick),var(--tick)) right top/14px 1px no-repeat,
    linear-gradient(var(--tick),var(--tick)) right top/1px 14px no-repeat,
    linear-gradient(var(--tick),var(--tick)) left bottom/14px 1px no-repeat,
    linear-gradient(var(--tick),var(--tick)) left bottom/1px 14px no-repeat,
    linear-gradient(var(--tick),var(--tick)) right bottom/14px 1px no-repeat,
    linear-gradient(var(--tick),var(--tick)) right bottom/1px 14px no-repeat;
}

/* ---------- cards ---------- */
.card{
  position:relative;
  display:block;
  overflow:hidden;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line);
  border-radius:20px;
  background:var(--cream);
  color:var(--ink);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}

a.card{
  color:inherit;
  text-decoration:none;
}

.card--link:hover{
  transform:translateY(-3px);
  border-color:rgba(109,40,217,.4);
  box-shadow:0 18px 40px rgba(16,16,20,.09);
}

.card--ink{
  border-color:rgba(246,242,233,.14);
  background:var(--ink);
  color:var(--paper);
}

.card--violet{
  border-color:transparent;
  background:var(--violet);
  color:#fff;
}

.card--tint{
  background:
    linear-gradient(160deg,rgba(109,40,217,.1),rgba(163,230,53,.08)),
    var(--cream);
}

.card--focus{border-radius:26px}

.card__index{
  position:absolute;
  right:14px;
  bottom:-.14em;
  color:var(--violet);
  font-size:clamp(56px,8vw,120px);
  font-weight:900;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.04em;
  line-height:.8;
  opacity:.14;
  pointer-events:none;
}

.card--ink .card__index{
  color:var(--violet-light);
  opacity:.22;
}

.card--violet .card__index{
  color:#fff;
  opacity:.18;
}

.card__kicker{
  display:block;
  margin-bottom:10px;
  color:var(--violet);
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
}

.card--ink .card__kicker,
.card--violet .card__kicker{color:var(--violet-light)}

.card__title{
  position:relative;
  z-index:1;
  margin:0 0 .4em;
  font-size:clamp(20px,2.4vw,28px);
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.01em;
}

.card__text{
  position:relative;
  z-index:1;
  margin:0;
  color:var(--muted);
  font-size:15.5px;
  line-height:1.75;
}

.card--ink .card__text{color:var(--on-dark)}
.card--violet .card__text{color:rgba(255,255,255,.84)}

.card__foot{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid var(--line);
}

.card--ink .card__foot{border-top-color:rgba(246,242,233,.16)}
.card--violet .card__foot{border-top-color:rgba(255,255,255,.24)}

/* ---------- media ---------- */
.media-frame{
  position:relative;
  display:block;
  aspect-ratio:16/9;
  width:100%;
  overflow:hidden;
  isolation:isolate;
  border:1px solid var(--line-dark);
  border-radius:16px;
  background:linear-gradient(135deg,#17141f,#101014 55%,#1d1230);
}

.media-frame::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background-image:
    linear-gradient(rgba(196,181,253,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(196,181,253,.14) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.55;
}

.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background:radial-gradient(circle at 78% 18%,rgba(109,40,217,.5),transparent 55%);
}

.media-frame img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}

.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--3x2{aspect-ratio:3/2}
.media-frame--wide{aspect-ratio:21/9}

.media-frame__tag{
  position:absolute;
  bottom:12px;
  left:12px;
  z-index:2;
  padding:4px 9px;
  border:1px solid rgba(246,242,233,.3);
  border-radius:999px;
  background:rgba(16,16,20,.7);
  color:var(--lime);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.06em;
}

/* ---------- editorial ---------- */
.prose{max-width:74ch}

.prose > * + *{margin-top:1em}

.prose h2{
  margin-top:1.8em;
  font-family:var(--serif);
  font-size:clamp(24px,3vw,34px);
  line-height:1.3;
}

.prose h3{
  margin-top:1.5em;
  font-size:20px;
  line-height:1.4;
}

.prose ul,
.prose ol{padding-left:1.25em}

.prose li{margin:.35em 0}

.prose a{
  color:var(--violet);
  text-underline-offset:3px;
}

.prose blockquote{
  padding:14px 18px;
  border-left:3px solid var(--violet);
  background:rgba(109,40,217,.06);
  color:var(--muted);
}

.note{
  padding:14px 16px;
  border-left:3px solid var(--violet);
  border-radius:0 12px 12px 0;
  background:rgba(109,40,217,.06);
  color:var(--muted);
  font-size:15px;
  line-height:1.7;
}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  color:var(--muted);
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.05em;
}

.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
}

.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}

.breadcrumb__link{
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
}

.breadcrumb__link:hover{
  color:var(--violet);
  border-bottom-color:var(--violet);
}

.breadcrumb__sep{color:rgba(16,16,20,.3)}

/* ---------- toc ---------- */
.toc{
  position:sticky;
  top:calc(var(--header-h) + 20px);
  padding:16px;
  border:1px solid var(--line);
  border-radius:16px;
  background:var(--cream);
}

.toc__title{
  margin:0 0 10px;
  color:var(--muted);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
}

.toc__list{
  display:grid;
  gap:2px;
  list-style:none;
}

.toc__link{
  display:block;
  padding:6px 10px;
  border-left:2px solid var(--line);
  color:var(--muted);
  font-size:14px;
  text-decoration:none;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}

.toc__link:hover{color:var(--violet)}

.toc__link.is-active{
  border-left-color:var(--violet);
  background:rgba(109,40,217,.08);
  color:var(--violet);
  font-weight:600;
}

/* ---------- reveal ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}

[data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- tablet / mobile header ---------- */
@media (max-width:1023px){
  body{padding-left:0}

  .rail{
    position:sticky;
    top:0;
    right:0;
    bottom:auto;
    left:0;
    z-index:80;
    display:flex;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    width:100%;
    min-height:var(--header-h);
    padding:8px 14px;
    border-right:0;
    border-bottom:1px solid rgba(246,242,233,.14);
  }

  .rail__progress{
    top:auto;
    right:0;
    bottom:-1px;
    left:0;
    width:auto;
    height:2px;
  }

  .rail__progress span{
    transform:scaleX(var(--p));
    transform-origin:left;
  }

  .rail__brand{
    flex-direction:row;
    gap:10px;
    padding-top:0;
  }

  .rail__brand-text{display:flex}

  .rail__wordmark{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.08em;
  }

  .rail__status{display:none}

  .rail__toggle{display:inline-flex}

  .rail__cta{display:none}

  .rail__nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    left:auto;
    z-index:95;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:18px;
    width:min(86vw,380px);
    height:100vh;
    height:100dvh;
    padding:18px 18px 24px;
    overflow-y:auto;
    border-left:1px solid var(--line-dark);
    background:var(--ink);
    box-shadow:-30px 0 60px rgba(10,10,16,.5);
    transform:translateX(102%);
    visibility:hidden;
    transition:transform .3s var(--ease),visibility .3s;
  }

  .rail__nav[data-open]{
    transform:translateX(0);
    visibility:visible;
  }

  .rail__nav-head{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
  }

  .rail__tagline{
    display:block;
    margin:0;
    color:var(--violet-light);
    font-family:var(--mono);
    font-size:11px;
    letter-spacing:.1em;
  }

  .rail__list{
    align-items:stretch;
    gap:6px;
    flex:0 0 auto;
  }

  .rail__link{
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:14px;
    width:100%;
    padding:13px 12px;
    border-bottom:1px solid rgba(246,242,233,.1);
    border-radius:12px;
  }

  .rail__link[aria-current="page"]::before{
    top:50%;
    left:0;
    width:3px;
    height:26px;
    transform:translateY(-50%);
  }

  .rail__index{
    min-width:22px;
    color:var(--violet-light);
    font-size:12px;
  }

  .rail__label{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.04em;
  }

  .rail__nav-foot{
    display:flex;
    flex-direction:column;
    gap:12px;
    margin-top:auto;
    padding-top:18px;
    border-top:1px solid var(--line-dark);
  }

  .rail__close{display:inline-flex}

  .rail__scrim{
    position:fixed;
    inset:0;
    z-index:90;
    display:block;
    background:rgba(16,16,20,.62);
    opacity:0;
    pointer-events:none;
    transition:opacity .3s var(--ease);
  }

  body.is-nav-open .rail__scrim{
    opacity:1;
    pointer-events:auto;
  }

  .toc{position:static;top:auto}
}

/* ---------- responsive grids ---------- */
@media (max-width:900px){
  .grid{grid-template-columns:repeat(6,minmax(0,1fr))}

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8,
  .span-9,
  .span-12{grid-column:span 6}

  .span-2{grid-column:span 3}

  .bento{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:600px){
  .container{width:calc(100% - 32px)}

  .grid{grid-template-columns:1fr;gap:14px}

  .grid > [class*="span-"]{grid-column:span 1}

  .bento{grid-template-columns:1fr;gap:14px}

  .bento__cell--wide,
  .bento__cell--tall,
  .bento__cell--focus{grid-column:span 1;grid-row:auto}

  .foot__top{grid-template-columns:1fr;gap:30px}

  .foot__cols{
    grid-template-columns:1fr 1fr;
    gap:24px;
  }

  .foot__dl{grid-template-columns:1fr}

  .foot__dl dt{margin-top:8px;padding-top:0}

  .foot__bottom{
    flex-direction:column;
    align-items:flex-start;
    gap:12px;
  }

  .foot__note{flex:0 0 auto}
}

@media (min-width:601px) and (max-width:960px){
  .foot__top{grid-template-columns:1fr;gap:32px}

  .foot__cols{max-width:560px}
}

@media (max-width:480px){
  .rail{padding-inline:12px}

  .rail__toggle{padding-inline:10px}

  .rail__toggle-text{display:none}

  .rail__nav{width:92vw}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }

  [data-reveal]{
    opacity:1 !important;
    transform:none !important;
  }

  .rail__progress span{transition:none}
}